LT5111B - A device for position definable fixing of a detail - Google Patents

Abstract

The invention relates to a device for position definable fixing of a detail. Centring means (1) comprises two supports (4, 5), which includes four centring pins (23), which are disposed by cross. A plate of fixing detail (7) comprises two groups of centring grooves (15, 16). One group of centring grooves (15) includes four centring groups (39) and second group of centring grooves (16) includes two centring grooves (39a), which are disposed on connection line on centres of both groups of centring grooves (15, 16).

Description

The present invention encompasses a device for positioning a part 5 in accordance with the general part of claim 1.

The term "positioning anchorage" will hereinafter be understood as anchoring an object, particularly a workpiece, to a precisely known, defined position in the machining device. In the first group, a well-defined position of the object in the two perpendicular directions of the X- and Y-axes can be achieved, as well as the corresponding adjustment in the Χ / Υ plane. Finally, further refinement of the subject matter provides a slightly more critical, but very important, defined position in the Z axis.

For fixing small parts, which have relatively smaller dimensions, known fastening devices are known, on which fasteners can be mounted. Pop-up centering necks and functional centering holes on the support, which are centered by the centering necks, provide positioning during mounting. When longitudinal positioning is provided with a Z axis, it is sufficient to predict two pairs of necks / holes interacting with each other, respectively, and one pair determines the positioning accuracy in the X and Y directions and the angular position of the interaction between the two pairs.

The basic premise for such known fasteners is that the centering necks, on the one hand, and the centering holes, on the other hand, are very precisely spaced relative to each other. This ensures a precise interaction between the necks and the holes, and at the same time the desired positioning of the support in relation to the anchorage. This requires high production costs and increases production costs, especially when there are high requirements for positioning accuracy, such as electro-erosion machining of parts. In addition, this arrangement is often geometrically aligned, especially when conical centering necks are used, where both pairs of necks / holes are theoretically independent of each other in the Χ / Υ direction.

Particularly negative is the disadvantage when relatively large 5 parts have to be secured. To obtain a stable position, the individual centering necks, respectively, the centering holes, are spaced as far apart as possible. This forms a noticeable 20 to 40 cm spacing between the individual pairs of necks / holes, with a noticeable deviation due to the potential for thermal expansion, respectively, contraction, which allows one or another centering neck to be positioned perfectly in the centering hole. However, high positioning accuracy is not achieved in this way.

A further problem is that when different supports are mounted on one and the same mounting (base), the possible thing from different production series also results in extremely small but high dimensional deviations at high accuracy requirements. It is clear from the above that the required accuracy of the position is not ensured.

From British Patent GB 2 033 263 is known a device for determining the position of a workpiece on a workbench, having a workpiece holder having a freely fastening workpiece and having centering holes, which for their function are arranged on the workbench and interact with the centering projections on them. necks.

The devices described are provided with four V-grooves (V-grooves) in the areas of the angled mounting pins, which logically correspond to the centering grooves of the claimed object, which interact with the popping necks (Vblocks), positioning the pallet in X and Y directions (as well as Z direction). ). There is a group of four widely spaced groove-neck pairs that take over all centering functions. It is clear that the accuracy of pallet centering on the machine table depends exclusively on the machining accuracy and the required position of the "V-blocks" and "V-grooves". The layout is geometrically defined and, with small variations in the V-groove position, puts the pallet in a minor position by securing a certain number of successive pallets, respectively, from different production series or at different temperatures.

German patent DE 31 15 586 discloses a machine tool pallet changing and centering device having a feed means for receiving a pallet loaded with a piece for picking up and delivering it to a workpiece. As soon as the pallet reaches there, the machining position is lowered until the pallet rests on one side of the Z-centering pins on the top plane, which does not perform any centering function in the X, Y, or angular directions. When the machining position is lowered, the upper edges of the conical centering pins are covered by the conical bushes, respectively. The bushings are axially spring-loaded and radially spaced. In this way it is possible to obtain a precise "tilt" of the pallet in the radial direction on the mounting pins.

With such an arrangement, it is not possible to achieve precise centering in the Χ / Υ directions and consequently in the angular direction, especially when the inter-axial distances of the centering pins on one side and the bushings on the other coincide. When the distance between the centering pins on one side and the bushing on the other is not exactly the same, the position of the pallet remains undefined. Here, according to the end position of the pallet, either one pair of pins and bushes, or the other, is defined within each other before the pins are engaged in the bushes; this is inevitably apparent in two different positions of the palette, which can be avoided by the present invention.

The object of the invention is to overcome said disadvantage and to improve the device described in the general part of Claim 1 of the invention so that through the reduction of precision, the supports are based mainly on the reciprocal distance of centering necks, respectively centering holes, and The desired high accuracy of positioning of the supports on the supports is achieved and maintained.

This task is solved by the means described in claim 1 of the invention.

In particular, for example, when there are two groups of centering grooves and centering necks, the task of one group is to position in the Χ / ir directions and determine the approximate angular position on the Z axis and at the same time determine the reference in the Z axis. At the same time, another group of tool clamps, based on their angular position, precisely positions in the Z axis. The reciprocal distance between the two centering hole / centering groups of necks is not very critical, so the distance between the second centering centering necks and the centering groove distance between these two groups may not be very accurate. From this it follows that tolerances of production, thermal changes of dimensions are taken over.

and similarly, preventing geometrical change in the position of the fixture on the work table.

Further refinement of the subject matter of the invention and accordingly other more preferred embodiments are described in the dependent claims 2-16.

The following is a more detailed example of a device according to the present invention, based on the accompanying drawings. The drawings show:

FIG. Top view of 1 centering device with two groups of centering necks;

FIG. 2 is a bottom view of an example of anchoring detail with two groups of centering grooves which are provided for interaction with the centering means according to FIG. 1;

FIG. 3, centering means and details for securing according to FIG. Side view 1 and 2;

FIG. 4 views from above with four outer and four inner centering necks;

FIG. 5 supports according to FIG. 4 side view;

FIG. Bottom view of the first 6 centering groups;

FIG. 6a a detailed view from below of the second centering group;

FIG. 7 is a sectional view of the first centering group taken along line VII-VII in FIG. 6;

FIG. 8 enlarged partial incision through centering necks;

FIG. 9 a view of a fixture rotated to a centering plate;

FIG. 10 is an enlarged sectional view of the centering plate and centering necks prior to centering the necks.

FIG. 11 the same cut as in FIG. 10, but after centering of the necks;

FIG. Top view of 12 workbenches with four groups of centering necks; and

FIG. 13 is a bottom view of an exemplary embodiment of a second embodiment of a fixture with four groups of centering grooves;

FIG. 1 is a schematic representation of the centering means 1, which can, for example, be positioned in a precisely known and defined position on a machine tool table.

On the upper surface of the centering means 1 are provided two supports 2 and 3 provided with a plurality of centering necks. A more detailed view of the supports 2 and 3 will be described in detail in FIG. 4 and 5. For convenience, both supports are shown identical.

FIG. 2 is a schematic view of the detail mounting plate 7 from below, which is a view of the facing side of the centering means 1. The elongated part fastening plate 7 has a set of centering grooves 15,16 in the region of its ends; which will be described in more detail below.

FIG. 3 shows a centering means 1 with both supports 2 and 3, as well as a detail mounting plate 7 from FIG. 1, respectively 2, in side view. The part mounting plate 7 is secured in front of the centering means 1 by means of two thrust fingers 36 and one of the ball retaining cartridges (not shown) provided in the supports 2 and 3, which are retracted by the thrust fingers 36. centering grooves 32 provided in the centering plate 32 (not shown in Fig. 3), which will be described below in the case where the part mounting plate 7 corresponds to the centering means 1. The selected centering necks 32 are fastened to the part by means of bolts 37 also serving as Zatrama. plates 7 and thus form both groups of centering holes 15 and 16.

FIG. 4 is a top view of the support 2, while FIG. 5 the same is shown in the side view. The support 2 comprises a cylindrical lower part 19 and a substantially square upper part 20 with four corners cut off. Also, the upper plane of the upper portion 20 has four raised plates 21 which extend along the center lines of the square. Also, the actual centering necks are formed on the plate 21. According to the example shown, the plates 21 have four inner centering necks 22 and four outer centering necks 23.

The centering necks 22 and 23 are substantially wedge-shaped and are arranged such that the free wedge edges 24 are aligned with one another in a straight line, the two apparent lines intersecting at right angles.

At the center of the support 2 is provided a spherical mounting cartridge 25 with spring-loaded, pneumatically actuated mounting rollers 26 which serve to accommodate the thrust finger. Such a spherical mounting cartridge is well known and does not require further consideration.

The four diagonally spaced upper surface areas 27 of the upper portion 20 of the abutment are precisely planarly polished and serve to accommodate spacer bolts, such as threaded bolts 37, for securing the centering plate 32 to the part mounting plate 7.

FIG. 8 is a partial section through a centering neck 23; centering neck 22 has the same transverse section. The centering necks 23 formed on the base 21 have symmetrical inclined lateral ribs: on the adjacent base 21, a region 30 with parallel lateral ribs is joined by a smaller inclined region 29, the upper portion of which moves to a steeper incline. How was. indicated, centering necks 23 interact with centering grooves. The heavily sloping upper portion 28 serves to facilitate the insertion of the centering necks into the grooves when the less sloping region 29 performs the primary centering function.

The formation of the centering groove groups 15 and 16 is shown in FIG. 6, 7, and 9. These figures show a top view, a partial section along line VII-VII. 6 and a side view of the centering plate 32, which is rotated to the side of the part mounting plate 7.

A ring-shaped pop-up collar 31 is provided on each of the centering grooves 15 and 16 on the part mounting plate 7, which serves as an installation (not shown) - a dirt and moisture protection enclosure.

Inside the rim 31 of the centering groove group 15, a circular centering plate 32 is provided which has a central bore 33. The thrust finger attachment 34 is secured in the bore 33, for example, by means of screws 35 on the workpiece attachment plate 7. a thrust pin 36 which is so constructed as to fit into the spherical mounting chuck 25 of the support 2 and 3.

The centering plate 32 is secured to the part fixing plate 7 by four screws 37; the screws 37 serve, as already explained, at the same time as the spacer bolts and enter their upper planes into the planarly polished upper plane regions 27 of the supports 2 and 3 when the fastening plate 7 is secured to the centering means 1. It defines the fastening plate 7 position and the position of the fasteners at the same time in the Z axis. In Sills 38, where the centering plate 32 is clamped with the part mounting plate 7, the latter is made slightly thicker than that arising from FIG.

The thickened areas 38 of the centering plate 32 in the case of the centering group 15 are joined by a thin bridge 40. All bridges 40 have a bold center section 41 provided with a centering groove 39. The thickness of the central section 41 is slightly less than that of the thickened area 38. not lying on the upper plane 7 of the component mounting plate; this is clearly shown in fig. 7. Two mutually aligned centering grooves 39 are arranged in a single line; both of these straight lines intersect at right angles. Centering grooves 39 extend over the entire width of bridge 40, and centering groove 39 has a depth of about 50-70% of the central section 41. Finally, the central section 41 is provided with a blind hole 42 provided from the underside of the centering plate 32. By way of example, their positions correspond to the positions and diameters of the outer centering neck 3 of the supports 2 and 3, which are slightly larger than the largest dimension 23 of the centering neck provided in a cut parallel to the upper plane of the upper portion 20. The width of the centering groove (39) approximates the width of the centering neck 23, as measured in the middle of the smaller incline region 29.

Because of the choice of centering plate 32 with thin bridges (40).

the central section 41 with the centering grooves 39 being elastically flexible in the axial direction, but in the circumferential direction, i.e., the inside plane of the centering plate 32, is nevertheless completely rigid. The height of the centering neck 23 is so selected that it is slightly compressed by the centering groove 39 in the center section 41 against the transverse 11. This displacement is so small that the stability in the circumferential direction is completely unaffected.

Centering group 16 according to FIG. 6a is basically done exactly the same, with the following differences:

Only two opposing centering grooves 39a are provided which lie in a straight line through both centering grooves 39 of the centering group (16), which according to FIG. 6 goes horizontally, that is, in the direction of expansion of the fastening plate 7 of the component. Further along the centering group 16, the bridge 40 and the bold central section 41 were removed; more precisely, FIG. 6, the two thickened areas 38 of the upper centering plate 32, as well as the two lower centering plates 32, pass through the thickened area 38a, thereby joining one another (FIG. 6a). Finally, the drilled hole 42a, in contrast to the blind hole 42 in the centering plate 32 of the centering group 15, passes through the hole.

FIG. 10 and 11 illustrate a situation before and after placement of the mounting plate 7 and centering means 1 on the supports 2 and 3. The centering plate 32 is at rest and the centering neck 23 is shown just before it enters the centering groove 39. The situation of FIG. 11 is such that the part mounting plate 7 is secured to the centering means 1. The centering neck 23 is inserted into the centering groove 39 and the center section 41 of the centering plate 32 is moved axially to the side of the part mounting plate 7. The less sloping side region 29 of centering neck 23 extends along the edges of centering groove 39 and thus acts to center the part mounting plate 7. The positioning of the Χ / Υ links on the mounting plate 7 secured to the centering member 1 is determined by the intersection of the two straight lines of the centering necks 23 of the recumbent support 5, where the centering group 15 is placed. the position of the mounting plate 7 based on the relatively large dimensions of the latter but with insufficient accuracy; due to the elasticity of the material, the ends of the centering group 15 of the fastening plate 7 of the component may be unauthorized. Therefore, the position of the centering group Y is further determined through interaction between the two centering necks 23 of the support 4 disposed in the X direction and the two centering grooves 39a of the centering group 16. The remaining two centering necks 23 of the support 4 have no function, here they are inserted into the bore holes 42a passing through the centering plate 32 of the centering group 16.

Any tolerances in the distance between the geometric center and the two adjacent supports and between two groups of adjacent centering grooves, as a result of thermal shrinkage or expansion or machining inaccuracies, do not affect the accuracy of the centering. The position of the Z axis Χ / Υ is determined only through the interaction of the individual supports (for example, Fig. 2 1) with the centering groove group 15. The centering groove group 16 (Fig. 2), for example, to be located on the support 3. may vary X. direction; here, the centering groove 39a is long enough and the blind bore holes 42 are large enough (Fig. 6a) to compensate for deviations.

Figures 12 and 13 show another example of a device according to the present invention.

FIG. 1 is a diagram of the centering means 1, for example, which may be positioned on a machine tool table in a position which is known and determined. Four supports are arranged on the upper plane of the centering means 1

2-5 which have many centering necks. A more detailed embodiment of the supports 2-5 is shown in FIG. 4 and 5. The end goal is to make identical all four supports 2-5.

According to FIG. 13 is a component mounting frame 6 having two transverse rails 11 r 12 which are interconnected by means of two longitudinal rims 13 and 14. Machining means (not shown) may be provided on both longitudinal 13 and 14; a description of their construction is not included in this description. In both

In the second transverse rails 11 and 12 there are provided two centering groove groups 15 and 16, respectively 17 and 18, the fulfillment of which has already been described above.

Frame 6 according to FIG. 13 is adapted to larger pieces, or 5 to a large number of small pieces and, according to their dimensions, can be mounted in its four corners; and the component mounting plate 7 according to FIG. 2 is suitable for smaller parts, respectively, for a small number of smaller parts, then two mounting points are sufficient.

Centering groove group 17 (FIG. 13) is identical to centering groove group 16, it also has only two centering grooves 39a. The centering plate 32 of the centering groove group 17, in contrast, is angled 90 ° with respect to this centering groove group 16 so that the centering groove 39a of the centering groove group 17 extends in the direction of the longitudinal 13.

The centering plate 32 of the centering groove group 18 ultimately has no centering groove, only, depending on the position, the four through-hole bores 42b corresponding to the four centering necks 23. In addition, the production is the same as for all the remaining centering groove groups.

Where appropriate, the X position of the centering groove group 17 is further defined by interaction of both centering necks 23 of the support 3 disposed in the Y direction with both centering grooves 39b of both centering groove groups 17. The remaining centering necks 23 of the remaining support 3 do not perform any function. They intervene in the bore holes 42a of the centering plate 32 of the centering groove group 17. The centering necks of the support 2 do not perform any function at all. They all fall into the 18 boreholes of the centering group

42b. Through the interaction of the support 2 and the centering groove group 18 is only determined

The Z position whereby the spacer bolts 37 are disposed on the support plane 2, which is equally sanded in the upper plane region 27.

In order to maintain simplicity and to maintain the ability of each desired support 2-5 to interact with the centering groove group 15, all supports 2-5 are made identical, although only one support, without exception, all four centering necks perform their function.

The device according to the present invention offers a remarkable variety of component mounting forms according to the need for layout, while maintaining a high accuracy of setting. It is simple and inexpensive, anti-fouling, has a self-cleaning centering neck - centering groove system that slowly wears out. If, after prolonged use, the centering necks and / or centering grooves are slightly worn, only the centering plate 32 with its central section 41 will be slightly deformed axially, which will not affect the accuracy of the arrangement.

Claims (16)

Definition of the Invention A device for setting a positioning piece on a work table, 5 having a part fastening plate on which the work piece is disassembled and which is provided with centering grooves which interact with corresponding centered necks placed on the work table and in front of them. , there is provided a first group of centering grooves (39) and centering necks (22; 23) which determine the position of the fixture plate in the X and Y directions, Device according to claim 1, characterized in that a second group of centering grooves (39b) and centering necks (22; 23) is provided at the first group of centering grooves (39) and centering grooves (22; 23), as a further group, which locates the component mounting plate (6; 7) only in the X direction, as does the third centering groove (39a), and A group of 20 centering necks (22; 23) which locate the part mounting plate (6; 7) only in the Y direction. 3. Device according to claim 1 or 2, characterized in that it has groups of centering necks of the supports (2, 3, 4, 5) which are provided at least with 25, four free wedge edges (24) of the two opposing centering necks (22; 23) disposed along a first line extending in the X direction and two free wedge edges spaced radially spaced apart by the centering necks (22; 23). the free wedge edges (24) of the centering necks (22; 23) are disposed along a second line in the Y direction. 4. A device according to claim 1 or 2, characterized in that it has groups of centering necks of supports (2, 3, 4, 5) which are provided with four wedge-shaped, evenly radially centered necks (22) and four wedge-shaped, evenly radially spaced centering necks (23) on a second, larger, concentric circle, and four centering necks (22: 5 lying central sections (41), which are connected via thin, plastic-springing bridges (40) to the solidified area (38) and provided with centering grooves (39a; 39b). Device according to claim 13 or 14, characterized in that the central sections (41) are slightly thinner than the thickened areas (38) and in front of the upper plane of the thickened area (38), which is rotated to the part mounting plate (11). retracted so that the center sections (41) can be spring-loaded against the mounting plate (11). 5. A device according to claim 3 or 4, characterized in that the upper plane of the supports (2, 3, 4, 5) provided with the 10 centering necks (22; 23) is at least a flat sanded area (27). 23) the free wedge ribs (24) extending along a first line extending in the X direction, and four free wedge ridges (24) of the other four centering necks (22; 23) disposed along a second line extending in the Y direction. 6. Device according to claim 3 or 4, characterized in that the supports (2, 3, 4, 5) are provided with a central mounting hole (25) and with the mounting device. 15 means (26) adapted to accommodate the thrust fingers (36). Device according to one of Claims 3 to 6, characterized in that the centering necks (22; 23) have a first, at least inclined, face to the upper plane of the support, a lateral region of the upper plane (29) and more 20 inclined lateral upper plane region (28) flush with wedge edge (24). Device according to one of the preceding claims 1 to 7, characterized in that the part fixing plate (6; 7) is provided with at least two at a certain distance. 25 centered groove groups (15, 16, 17, 18) having a centering plate (32), furthermore, a centering plate (32) of the first centering groove group (15) is provided with four centering grooves (39) having the arrangement corresponds to the centering necks (22: 23) of the supports (2, 3, 4, 5). and besides. the centering plate (32) is provided with at least two centering plates 30 groups (16; 17) with centering grooves (39) arranged in a connecting straight line through the center of the first centering groove group (15) and through the center of another centering groove group (16 or 17). 9. A device according to claim 8, characterized in that the part fastening plate has the shape of a rectangular frame (6) with groups of centering grooves (15, 16, 17, 18) arranged at four corners. A centering group (18) without centering grooves is provided in the recesses (39a; 39b) and opposite corners. Device according to claim 9, characterized in that the frame (6) is provided with a first group of centering grooves (15) with four centering grooves (39), one further centering groove group (16, 17) being provided at two adjacent corners. two centered 10, characterized in that, at least at a distance from the first group, a further group of centering grooves (39a; 39b) and centering necks (22; 23) is provided which defines the position of the component mounting plate (6; 7) in X or Y directions only. 15th Device according to one of Claims 8 to 10, characterized in that the centering plates (32) of all centering groove groups (15, 16, 17, 18) are: 15 are secured to the part mounting plate (6; 7) using four spacer screws (37). Device according to one of claims 8 to 11, characterized in that the centering plates (32) of the centering groove groups (16, 17, 18) are 20 provided with two (39a; 39b), respectively, with no centering groove-free boreholes (42a. 42b) including centering necks (23), with centering groove groups (16, 17, 18) resting on disposed supports (2, 3,4). 25th Device according to one of Claims 8 to 11, characterized in that the centering plate (32) of the first group of centering grooves (15) has four thickened areas (38) disposed in the area of the spacer screws (37) and four, respectively, in the middle. the central sections (41) lying in the thickened areas (38). which are located through thin, plastic-springing bridges (40) 30 are joined to the thickened areas (38) and are provided with centering grooves (39). Device according to one of Claims 8 to 11, characterized in that the centering plates (32) of the second and third groups of centering grooves (16,17) have two mutually spaced bores extending between two adjacent spacer screws (37). 38) and two, respectively, in the middle between the two bold areas (38) 15th Device according to one of Claims 8 to 15, characterized in that the centering groove groups (15, 16, 17, 18) are provided with one visible central popping thrust (36).